Ubuntu Server Grub does not autoboot the default option

Fuente: http://askubuntu.com/questions/214972/grub-does-not-autoboot-the-default-option-after-upgrade-to-12-10

My /etc/default/grub has only these effective options:

GRUB_DEFAULT='Ubuntu'
GRUB_HIDDEN_TIMEOUT=1
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=1
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""
GRUB_TERMINAL=console

Add the following to /etc/default/grub

GRUB_RECORDFAIL_TIMEOUT=0

Save and run

sudo update-grub